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E. J. ROHNE.

ELECTRIC SOLDERING IRON.

- APPLICATION FILED APR.29. 1916.

Patented July 8, 1919.

/NVE/VTOR fveo f. P06/7e 5) /7//5 TTOP/YEYS -new and useful Improvementsin Electric Soldering-Irons; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will en-v able others skilled in the art to which it appertains to make anduse the same.

My invention relates to improvements in electric soldering irons; and, to thisend, it consists of the novel'devices Vand combinations of devices hereinafter *described and defined in the claims.

In the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout theV several views.

Referring to the drawings:l

Figure 1 is a view `of the improved soldering iron principally in side elevation with some parts shown in longitudinal central section; ,J

Fig. 2 is a fragmentary view of the handle end of the soldering iron, on an enlarged scale, some parts being shown in longitudi- S u nal central section;

the soldering iron isf he Fig. 3 1s a transverse section taken on the irregular line X3 X3 of Fig. 2;

Fig. .4 is a. transverse section taken on the line X4 X4 of Fig. 1, on an enlarged scale;

Fi 5 is a transverse section takenon the line 5 X5 of Fig. 1;4 and K Fig. Gis a side elevation of the heating ele! ment and body member, removed from the soldering iron.

The numeral 1 indicates a tubular stem detachably holding, at one end, a solder applying element 2, usually 'designated vas the point of the soldering iron. This point is preferably formed from drawn copper for the reason that it does not oxidize like cast copper. Onthe other end of the stem 1 is ahandle 3, preferably of wood, by which ld'. -The forward end of the stem 1 is materially expanded to afford a cylindrical casing 4 into the front open end of which is removably telescoped a metallic socket 5 having a tapered recess 6. Into thistapered recess 6,

- the tapered shank of the point 2 is removably inserted.

The socket 5 is made of iron or of material whose coeicient of expansion is less than'` that of the copper point 2. By such an ar- ELECTRIC soLDEmNmoN.

:"Sp'ei'ieaticn of Letters Patent. e .1, Application filed April 29, 1916. Serial 170.194,285.

UNITED STATES PATENT OFFICE.

.l E VEN J. ROHNE, 0F MINNEAPOLIS, MINNESOTA. I

. Patented July s, 1919.

rangement.` the copper point 2 may normally loosely fit within the recess 6 and when it is heated it'will, by greater exparbV sion, be tightly held in the socket 5. Preferably the socket 5 is of cast steel. The flanges of the socket 5 tightly fit within the casing 4, and said socket is firmly held against endw1se moyement therefrom by screws 7 passed through holes in the casmg 4 andhaving screw thread engagement with the forward flange of the socket 5. 4As shown the socket 5 is somewhat rshorter than the casing 4 to afford a clearance space for electric Wires betweenthe inner endl of said socket and the adjacent end of said casing.

Extending radiallyvfrom the inner end of the casing 4 are four circumferentially spaced legs 8 which, when the soldering iron is laid down, hold the point4 2 above the support on which the soldering iron rests to prevent burning thereof.

An insulating disk 9 of mica or other suitable material covers the inner end of the socket 5 and a screw 10 detachably secures the same thereto. Secured to this disk 9 and extending therethrough is a pair of diametrically opposite binding posts 11. To these binding posts 11, are secured the ends of a heating element orwirj 12. From the binding posts 11 the wir@J 12 is extended through apertures in the inner flange of the socket The heating elementl 12 may b'e, and pref-- fierably is, of the type disclosed and .claimed -in my March the 30, 1915, and entitled Electric yheatin element. y I

- Lea wires from any vsuitable source of electrical energy are attached to the contacts of a switch, indicated as an entirety by the numeral 14. The switch 14 is detachably attached 'by screws to the outer end of the handle 3 and may be of any desired make. A pair of wires 15Aconnect the switch contact with the binding screws 11. These wires extend lthrough the stem 1 andare laid in grooves formed in an insulating block 16 :and secured thereto by binding screws 17.

' The rear end portion of the stem 1 is ex- .sal

U. S. Lett-ers Patent, 1,133,579, issued pandedl and provided with a lateral opening to receive the block 16 which completely fills the said stem, see Fig. 3. -A stop collar 18 on the stem 1 limits the telescopical movement of the handleI 3, thereon. Ob-

-viously, by manipulating the switch 14, the

heat at the point of the soldering iron may be controlled. Circumferentially and longitudinally spaced air holes 19 are found ,metals, I have found that cast iron and-cop per. are best suited, respectively, for the socket and point of my improved soldering. iron for the reason that the cast iron will retain the heat and the copper radiate it. By providing the point with a relatively large shank andtelescopf'ng the same into the socket, a large heating surface for the point is obtainedl This large heating surface draws the heat from the socket and delivers the same through the point to the work where the heat is needed. Also, by making the heating surface of the point large, the heat is drawn from the sockets so fast that it does not pass into the casing and stem and thereby the remainder of the soldering sirable.

i* Witnesses: iron is kept cool, which is highlyy de- The above described soldering iron has been put into commercial use and has proven highly efiicient for the purposes hadin view.

What I claim is: y 1. In an electric soldering iron, the combination with a tubular stem .having at one vend a point, of a handle removably mounted on the other end of the stem, a switch secured to the handle, lead wires securedto the switch, a heating elementfor thepoir`it,

and binding screws securing said wlres thereto.

2. An electric soldering iron having a metallic socketf a point carried' by said socket, and a heating wire folded upon itself and coiled in double parallel arrangement around said socket so that thegmagnetic action of the core will be neutralized, and

lead wires' connected to the terminals of said coil.

In testimony whereof I affix my signature l witnesses.-

in presencel of two EVEN J. ROI-INE.

EVA E. KNIG, HARRY D. KILGORE. 

